ICP Defrost Control Board for YD018GA – OEM Heat Pump Defrost Board | Ships Today
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Overview
This genuine OEM defrost control board (part number 34330100) manages the defrost cycle on the ICP / Tempstar / Heil YD018GA heat pump. In heating mode, frost and ice build up on the outdoor coil; the defrost board monitors coil temperature and elapsed run time, then periodically reverses the unit into a brief cooling cycle to melt the ice while the auxiliary heat protects supply temperature. The board coordinates the reversing valve, the outdoor fan, and the defrost timer/sensor inputs. When it fails, the heat pump either ices over completely (no defrost) or defrosts constantly (wasting energy and short-cycling). Because the board carries both line and low-voltage signals, failures often show up as a dead outdoor unit, an iced coil that never clears, or erratic mode switching.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34330100 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil |
| Function | Defrost cycle timing & coordination |
| Control Voltage | 24 VAC |
| Fit | OEM Replacement |
| Application | Heat Pump Outdoor Unit |
Compatibility
Direct OEM replacement for the ICP / Tempstar / Heil YD018GA heat pump and other ICP-family outdoor units that specify the 34330100 defrost control board. Verify the part number and connector layout on your existing board before ordering.
Installation Guide
- Safety First – Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access – Remove the condensing unit service panel to reach the control box.
- Document – Photograph every wire and connector plugged into the old board.
- Remove – Unplug the connectors, release the mounting standoffs/screws, and lift out the old board.
- Install – Seat the new board on the standoffs and reconnect every plug exactly per your photo.
- Test – Restore power, run a heat call, and confirm normal operation; initiate a forced defrost (per the board's test pins) to verify the cycle.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts in heating mode.
- Unit goes into defrost constantly or at the wrong times.
- Outdoor unit completely dead despite good incoming power.
- Erratic reversing-valve or fan behavior during defrost.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days